character: Carl the Cardiologist
topic: Circulatory System Dynamics
grade: 10
subject: Biology
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character: Annie the Aorta
topic: Blood Vessel Function
grade: 10
subject: Biology
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character: Bella the Blood Cell
topic: Hemoglobin and Oxygen Transport
grade: 10
subject: Biology
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character: Vinny the Vein
topic: Venous Return and Circulation
grade: 10
subject: Biology
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